How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 11/17100.0*Chance in playoffs100.0*Average seed
Shara 71.8 Tom H 63.14 +20.1
+1.0
Ethan 111.1 Shawn 96.48 +3.1
+0.1
Laurel 94.74 Jenn 97.14 -3.0
-0.1
Tom K 52.98 Riley 68.8 -1.8
-0.1
Dave 93.34 Eric 88.58 -0.7
-0.1
Justin 117.72 Erica 70.68 +0.5
If winner is:HomeAway
Week of 11/24100.0*Chance in playoffs100.0*Average seed
Shara vs Shawn+28.0-28.0
+1.2-1.2
Erica vs Ethan-5.4+5.4
-0.1+0.1
Justin vs Tom K-4.3+4.3
-0.2+0.2
Jenn vs Eric-4.1+4.1
-0.2+0.2
Laurel vs Riley+3.0-3.0
Dave vs Tom H-0.3+0.3
-0.1+0.1

What If

Chances based on how well the Shara finish out the regular season.   Explain

100100100100100100100100100100100100
If finish:Chance inChance will finish regular season at seed
TWW-Lplayoffs123456789101112Count
82-0In730421824,178,802
71-177.5%17264419308,354,873
60-23.20313364164,179,461
Total:64.6%28141823131110116,713,136
Games Above .500
Chance Will Make Playoffs